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Question:

What are DC and AC servo motors? What are the characteristics?

What are DC and AC servo motors? What are the characteristics?

Answer:

DC servo motor can be used in spark machine, machine hand, accurate machine, etc. at the same time, it can be added with reducer, which makes the equipment reliable and high torque.
A rotating motor with input or output as direct current energy. Simulation of speed control system it is generally consists of 2 closed loop, both speed loop and current loop, which enables the two to coordinate each other, play the role of the 2 regulators in the system set up, adjust the speed and current respectively. The 2 feedback closed loop adopts the nested structure of one ring and one ring in structure, which is called double closed loop speed regulating system. It has the advantages of fast dynamic response and strong anti-interference ability, so it has been widely applied. PI or PID circuit is usually composed of analog operational amplifier, and the signal conditioning is mainly to filter and amplify the feedback signal. Considering the mathematical model of DC motor speed control system, simulation of dynamic transfer function in the debugging process simulation of speed control system, because the parameters of the motor or load the mechanical characteristics and the theoretical value is different, often require frequent replacement of R, C and other components to change the circuit parameters, dynamic performance index to obtain the expected, do it is very troublesome, if the use of programmable analog components regulator circuit, system parameters such as gain, bandwidth and circuit structure can be modified by the software, it is very convenient for debugging.
Into a DC servo motor brush and brushless motor, brushless motor has the advantages of simple structure, low cost, high starting torque, wide speed range, easy control, maintenance, maintenance is convenient but (for brush), will produce electromagnetic interference, the environment requirements. Therefore, it can be used for cost sensitive ordinary industrial and civil occasions. Brushless motors are small in size, light in weight, large in output, fast in response, high in speed, low in inertia, smooth in rotation and stable in torque. It is easy to realize intelligent, and its commutation mode is flexible. It can be changed by square wave commutation or sine wave commutation. The utility model has the advantages of no maintenance, no carbon brush loss, high efficiency, low running temperature, small noise, small electromagnetic radiation, long service life and various environments.

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